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service; help; assistance; discount; special offer; freebie; complimentary item; utility; amenity; after-sales service; maintenance; serve; service (sports)noun, suru verb
に
direction, time, indirect object, or target markergrammar
不満
dissatisfaction; discontent; complaintnoun, na-adjective
が
subject markergrammar
ある。
be; exist; have; possess; there is available; be located; be situated; be equipped with; have as a facility or feature; happen; take place; come about; be in a completed state; be left as done-> 有るgodan verb, auxiliary